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EMC单片机写的I2C程序

EMC单片机写的I2C程序

点击数:7166 次   录入时间:03-04 11:38:45   整理:http://www.55dianzi.com   义隆单片机
                      BC    R6,SCL        SCL=0
                      CALL    IIC_DELAY
                      RET
                     
                 
            ;********************************************************************
                  ;IIC_SNACK
                  IIC_SNACK:
                      BS    R6,SDA        SDA=1
                      NOP
                      BS    R6,SCL        SCL=1
                      CALL    IIC_DELAY
                      BC    R6,SCL        SCL=0
                      CALL    IIC_DELAY
                      RET

                 
            ;********************************************************************
                  ;IIC_WBYT
                  IIC_WBYT:
                      MOV    TREG,A
                      MOV    A,@8
                      MOV    TCNT,A
                  IIC_WBYT1:
                      BC    R6,SCL        SCL=0
                      JBC    TREG,7
                      JMP    IIC_WBIT1
                      JMP    IIC_WBIT0
                  IIC_WBIT1:
                      BS    R6,SDA
                      JMP    IIC_WBYT2
                  IIC_WBIT0:
                      BC    R6,SDA        SDA=X
                      JMP    IIC_WBYT2
                  IIC_WBYT2:
                      RLC    TREG
                      CALL    IIC_DELAY
                      BS    R6,SCL        SCL=1
                      CALL    IIC_DELAY
                      DJZ    TCNT
                      JMP    IIC_WBYT1
                      BC    R6,SCL        SCL=0
                      CALL    IIC_DELAY
                      RET
                     
                 
            ;********************************************************************
                  ;IIC_RBYT
                  IIC_RBYT:
                      MOV    A,@8
                      MOV    TCNT,A
                      SET SDA INPUT
                      IOR    IOC6

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